Yeah, we already knew that Karlach and Minsc were coming (if you paid attention to the data mining) and Helia seems to have been replaced by Jaheira, which I’m cool with.
Man, if it's true that Jaheira is coming in as a replacement for Helia I'd be massively disappointed. "A bard werewolf halfling" sounded a lot more interesting than "Here's that companion you never actually liked from the old game, AGAIN".
Speak for yourself, Jaheira remains one of the best-written characters in the saga. It is true, though, that we'll have to see what Larian does with her since they are not among the best in terms of scriptwriting and writing.